5x 100 to LBP hub adapters

SBP is measured in inches, 5x4
so in metric that would be 5x101.6

that 1.6 mm is about 1/16th of an inch, so the difference may be considered negligible

as you have noticed, it works just fine for rolling around, but personally i would not want to run at 45 MPH on them
Not to muddy the waters, BUT I have been running the exact same 1" spacers/adapters on my street driven Duster for 2 years now with no issues at all. And I've gone well over 45 MPH without a wobble or anything. Are they ideal, no but not a glaring safety hazard either. With that said, would I run them on the drag strip? Probably not, but they are a means to an end until the SBP to BBP swap can be done.